Parts for your 2013 Toyota Mark x-Sump plug washers

2013 Toyota Mark X sump plug washers

Yes, the 2013 Toyota Mark X (GRX130/133, 4GR‑FSE and 2GR‑FSE engines) uses a sump plug washer. Technical references that call this out include the Toyota Repair Manual for the GRX130 series (Engine Oil – Replacement procedure), which instructs replacing the drain plug gasket at each oil change, and the Toyota Electronic Parts Catalog (EPC) listing an aluminium drain plug gasket, part number 90430‑12031 (12 mm), for the Mark X oil pan drain. These factory sources make it clear the washer is a required sealing component rather than an optional extra.

On this Toyota, the sump plug washer (often called a crush washer) is a small, single‑use aluminium gasket that sits between the sump plug head and the oil pan. When the plug is torqued, the washer compresses to form a reliable seal so engine oil doesn’t weep past the threads or the plug face. It’s a simple bit of kit that prevents drips on the driveway and protects against low oil levels over time. Because it deforms to seal, it can’t spring back to its original shape—reusing it risks seepage, especially once the washer has been flattened from a previous service.

As part of routine servicing on a 2013 Toyota Mark X, this washer should be replaced at every oil change. Toyota’s workshop procedure specifies installing a new drain plug gasket and tightening the sump plug to the correct torque—commonly 39 N·m (check the repair manual for the exact spec for the vehicle’s engine code). Nipping it up tighter doesn’t equal better, over‑torque can distort the pan face or strip threads. Best practice is: clean the sealing surface on the pan, fit a genuine‑spec 12 mm aluminium washer (90430‑12031 or quality equivalent), hand‑start the plug to avoid cross‑threading, then torque to spec. If the old washer sticks to the pan, carefully remove it without scratching the surface. For drivers clocking regular kilometres across Australia and New Zealand, pairing fresh oil, a new filter and a new crush washer each service keeps the Mark X tidy and leak‑free.

• Signs a new washer is needed: dampness around the plug after a service, persistent oil spots under the sump, or a washer visibly flattened or grooved.
• Avoid thread tape or sealants—Toyota’s design relies on the crush washer and proper torque, not goop.

Does the 2013 Mark X definitely need a sump plug washer, and what size is it?

It does. Toyota’s EPC lists a 12 mm aluminium crush washer (P/N 90430‑12031) for the GRX130/133 Mark X. It’s designed as a single‑use seal and should be replaced whenever the engine oil is changed.

How often should the sump plug washer be replaced on a Mark X?

Every oil change. Whether servicing at 10,000 km or annually (whichever comes first), fit a new washer when refilling with fresh oil. That keeps the sump sealed properly and avoids weeping around the plug.

Can a small leak be fixed by reusing the old washer or adding thread tape?

Reusing the old washer or adding thread tape isn’t recommended. The crush washer does the sealing when it’s compressed once, and Toyota’s spec relies on that fresh gasket plus correct torque. If there’s a weep, fit a new washer, check the pan face is clean and flat, and torque to the factory value.